Durable Hydrophobic Iridescent Films with Tunable Colors from Self-Assembled Cellulose Nanocrystals.

Autor: Li Z; Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada., Wang P; Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada., Zhang Y; Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada.; Department of Physics and Astronomy, The University of British Columbia, 6224 Agricultural Rd., Vancouver, BC, V6T 1Z1, Canada.; Stewart Blusson Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, BC, V6T 1Z4, Canada., Michal CA; Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada.; Department of Physics and Astronomy, The University of British Columbia, 6224 Agricultural Rd., Vancouver, BC, V6T 1Z1, Canada., MacLachlan MJ; Department of Chemistry, University of British Columbia, 2036 Main Mall, Vancouver, BC, V6T 1Z1, Canada.; Stewart Blusson Quantum Matter Institute, University of British Columbia, 2355 East Mall, Vancouver, BC, V6T 1Z4, Canada.; WPI Nano Life Science Institute, Kanazawa University, Kanazawa, 920-1192, Japan.; Bioproducts Institute, University of British Columbia, 2360 East Mall, Vancouver, BC, V6T 1Z3, Canada.
Jazyk: angličtina
Zdroj: Small (Weinheim an der Bergstrasse, Germany) [Small] 2024 Dec 24, pp. e2409701. Date of Electronic Publication: 2024 Dec 24.
DOI: 10.1002/smll.202409701
Abstrakt: Cellulose nanocrystals (CNCs) are known to self-assemble into a left-handed chiral nematic lyotropic liquid crystalline phase in water. When captured in the solid state, this structure can impart films with photonic properties that make them promising candidates in photonics, sensing, security, and other areas. Unfortunately, the intrinsic hydrophilicity of CNCs renders these iridescent films susceptible to moisture, thereby limiting their practicality. To address this issue, a novel strategy to prepare hydrophobic iridescent films from pre-assembled CNC films is reported here. These films underwent a swelling process, followed by esterification using acid anhydrides to render them hydrophobic. By increasing the alkyl chain length of the anhydride reagent, the hydrophobicity of the resulting iridescent films can be enhanced. They showed water contact angles ranging from 34° to 115° and demonstrated tunable structural color spanning from blue to red. Moreover, they also exhibited good durability when exposed to water for 24 h. This innovative method for producing durable hydrophobic iridescent thin films is expected to facilitate their use in water-proof photonic coatings, optical sensors, and other applications.
(© 2024 The Author(s). Small published by Wiley‐VCH GmbH.)
Databáze: MEDLINE
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